Update basic documentation and add analyzer documentation and process

[rjmurillo]

Changes

• Add contributing guidelines
• Add code of conduct
• Add documentation on how to document analyzers (with templates and examples)

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (15bc4cdcbd45adb2222f972611f353a937913ae7) | 229 | 165 | 72.05% | | | Head commit (b399ef9f3d42d68e32f720ff6fce15d90186161f) | 229 (+0) | 165 (+0) | 72.05% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#8) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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